Abstract

The polarization effects in tilted fiber Bragg grating (TFBG)
refractometers are investigated theoretically. The polarization effects may
degrade the sensor performance greatly, and should be considered to achieve
high-precision surrounding refractive index (SRI) measurement. The possible
paths to reduce the influence of polarization effects are discussed. For
large SRI changes, the cutoff resonance wavelength can be used as sensing
parameter to achieve a polarization insensitive SRI measurement with linear
sensitivity of ${\sim}$500 nm/u.r.i and SRI uncertainty of ${\sim}10^{-3}$ over SRI range of 0.1; for tiny SRI changes the measurement can
be refined by monitoring proper individual resonance (close to the cutoff
resonance wavelength) with accuracy approaching $2.5 \times 10^{-5}$ over a SRI range of 0.001.

References

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